240sx s13 Walbro fueling Issue

[Louprint]

Hey everyone,

I just upgraded my stock fuel pump to a walbro 255 on my '89 240sx hatch. It has an sr20det swap with z32 fuel filter and stock FPR.

It ran great for a little bit, but after the car was driven for around 30 minutes, it started to have hesitation issues. it popped the fuel pump fuse twice and I thought my wiring was an issue, so I cleaned it up as best I could and it stopped popping. But It got progressively worse the more I drove it and now it will barely go beyond 2500rpm without shuddering and bogging like crazy. Cant even go into boost at all. It will not cruise on the highway without major hesitation either.

I replaced the fuel filter, made sure my wiring on the fuel pump was ok, and checked just about everything.

Any help would be appreciated.

[PapaSmurf2k3]

Almost sounds like a bad pump. What size fuse are you running?

[Louprint]

15amp at the moment, I know it should be 10amp. I was just testing

[PapaSmurf2k3]

I'm running 15 amp as well. No big deal.

[Brandonnosecay]

have you checked inside your fuel tank for any kind of dirt or rust maybe. Just something to check as well. Before I upgraded to my walbro I was having similar issues and my tank was filled with rust inside for some reason. Changed my tank and got the walbro and everything was back to normal. If everything else is fine it could just be a bad pump.

[914slide]

check voltage drop on the harness/bad relay/ground issues, the pump is powered by a 18g wire all the way from the front i suggest you hard wire it to the battery with a relay using the old power wire.